贵州省云南鳅属鱼类一新种记述(鲤形目:鳅科)

A NEW SPECIES OF THE YUNNANILUS FROM GUIZHOU, CHINA (CYPRINIFORMES: COBITIDAE)

本文报道产于贵州草海的云南鳅属(Yunnanilus)鱼类一新种,定名为草海云南鳅Y.caohaiensls sp.nov.。对新种的形态特征作了详细描述,并与相似种黑斑云南鳅Y.nigromaculatus(Regan)进行了比较研究。

Yunnanilus caohaiensis sp. nov. (fig. 1-3)Holotype No. 900077, adult male, total length 85 mm, standard length 72 mm, collected on April 25, 1990. in Caohai Lake of Weining County (26°49’-26°53’N, 104°12’-104°18’E, altitude 2172 m), Guizhou Province, China, Allotype: No. 900052, adult, total length 69 mm, standard length 58 mm, date and locality same as holotype. Paratypos: 350 specimens, measurement 110 specimens, total length 27-85mm. standard length 22-69 mm, date and locality same as holotype. Paratype No. 900053 specimen is kept in the Institute of Hydrobiology, Aca-demia Simica, Wuhan, China. Other specimens are kept in the Museum of Sichuan Institute of Natural Resource.D. iii-9; P. i-11; V. i-7; A. iii-5; C. i-14-i; Gill-rakers 10-13 on the inner row of the first arch; Vertebrae 4 + 30 + 1 (15 specimens).Depth of body. 3.8-4.5 (4.2), head length 3.3-4.0 (3.6), length of peduncle 7.8-9.1 (8.4), depth of peduncle 8.5-9.3 (8.9) in standard length. Snout 2.5-3.6 (3.0), eye 3.5-5.0 (4.2), interorbital space 2.3-3.6 (2.8) in head length. Depth of caudal peduncle 1:0-1.1 (1.0) in its length.Diagnosis The new species differs from Y. nigromaculatus (Regan) in the following aspects: 1. bare and scale less on the back, thorar and abdomen with sparse scales on the sides of its body; 2. dorsal fin iii-9; 3. caudal peduncle lower and longer; 4. vertebrae 4+30 + 1; 5. hind nares bar seperated from its anterior edge of eyes.